Just changed the glow plugs and noticed that the sleeves that fit over the plugs are breaking up, I suppose due to time and heat. This last inch or so that connects to the plugs appears to be 'changeable' from the wiring loom/rail. I appear (or hope so) to have the connection to the top of the plugs but the sleeve that fits over the plugs further down may hold it in place and protect the plugs and that is my worry. Can anyone confirm that these 'sleeves' are available and, if so, their part number.

Many thanks